I’m trying to prep a plaster over stucco wall for painting….1940’s house. The wall paper has been removed and there are lots of little dings that need to be filled. The ‘big’ problem is a missing piece of plaster, 10″ X 16″. The cement stucco is in good shape. I was going to use Plaster-Weld over the cement and Patching Plaster over the Plaster-Weld. The plaster adjacent to the missing plaster is intact but has come loose from the cement. I contacted Plaster-Weld and asked if the product could be dripped between the cement and plaster to adhere it….company rep wasn’t sure. I’ve seen some internet blogs that have some suggestions on how to secure the loose plaster, e.g. screws with washers, drill holes and inject adhesive, etc.
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Why don't you go ahead and remove the loose plaster, since you will be doing patching anyway? It's not much more trouble to plaster 10 sq ft than to plaster 1 sq ft -- most of the work is in the setup and mixing.
Jim
White glue or any pva titebond.
I always drip, brush in, somehow slather it around the edge of the top coat/base coat joint on a patch.
Drag your fingernails or any tool that will resonate the hollow sound of loose top coat plaster. Take away the very loosest and hollow plaster. Apply the glue. Cover everything under what you're going to patch with plasterweld.
Calvin
Would it make sense to screw metal lathe to the concrete stucco and the apply the plaster to the metal lathe?
Jim
If this is a spot where the finished plaster is gone but the scratch coat is still solid with no cracks, I wouldn't mess with wire lath. If minor scratch coat cracks, I'd dig them out somewhat, slather in some titebond, let set up and then finish coat the plaster.
I really hate coming back for a small hole.
Calvin
It's plaster over cement stucco. The missing plaster piece measures 10" X 16". The cement stucco is solid. Instructions said apply plasterweld to the stucco and then apply plaster to the plaster weld. I'm not sure I can find the plaster weld easily. I've used the metal lathe and applied cement stucco to it. Just wondering if it's feasible to apply plaster to the metal lathe.
Jim
I'm nothing close to a stucco guy.
but here's the dumb carpenter opinion.
the scratch coat is the structural, the plaster finish is the icing on the cake. Wire mesh in my thinking would add nothing structural, thickness wise might get in the way of the finish.
plasterweld and concrete glue (bonding additive) are or are close to pva glue. That's why I suggested pva Titebond as the butter between the two layers. This will help bond the scratch and finish layers. Don't ask me for a scientific backup but just years of use and advice.